1 Answer
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Judging from the picture (he is recalling something), I think the description in the linked article is correct. This って (at the beginning of the second sentence) is a quotative particle, and it's referring to what was said in the previous balloon.

って、３組の木村が（言ってた）…！！
...which is what Kimura in the class 3 said!
...that's what I heard from Kimura!